package provider

import (
	"strings"
	"testing"
)

const validKVMYAML = `
providers:
  - name: kvm-home
    type: kvm
    kvm:
      sshKeyFile: /etc/proxy-operator/kvm/id_ed25519
      knownHostsFile: /etc/proxy-operator/kvm/known_hosts
      diskSizeGb: 20
      images:
        debian-13:
          url: https://cloud.debian.org/images/cloud/trixie/latest/debian-13-generic-amd64.qcow2
          sha256: 0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef
        ubuntu:
          url: http://mirror.local/noble.img
          format: raw
      machineTypes:
        small: {vcpus: 1, memoryMiB: 1024}
        medium: {vcpus: 2, memoryMiB: 2048}
      hosts:
        - name: nas1
          address: nas1.home.lan:22
          user: virt
          bridge: br0
        - name: lab2
          address: 10.0.0.2:2222
          user: root
          socket: /run/libvirt/virtqemud-sock
          pool: fast
          bridge: br1
`

func TestLoadConfig_kvmValid(t *testing.T) {
	t.Parallel()
	cfg, err := LoadConfig([]byte(validKVMYAML))
	if err != nil {
		t.Fatalf("LoadConfig() error = %v, want nil", err)
	}
	k := cfg.Providers[0].KVM
	if k == nil {
		t.Fatal("providers[0].kvm = nil")
	}
	if k.SSHKeyFile != "/etc/proxy-operator/kvm/id_ed25519" || k.DiskSizeGB != 20 {
		t.Errorf("kvm = %+v, want sshKeyFile and diskSizeGb parsed", k)
	}
	if got := k.Images["debian-13"].SHA256; !strings.HasPrefix(got, "0123") {
		t.Errorf("images[debian-13].sha256 = %q", got)
	}
	if k.Images["ubuntu"].Format != "raw" {
		t.Errorf("images[ubuntu].format = %q, want raw", k.Images["ubuntu"].Format)
	}
	if mt := k.MachineTypes["medium"]; mt.VCPUs != 2 || mt.MemoryMiB != 2048 {
		t.Errorf("machineTypes[medium] = %+v, want {2 2048}", mt)
	}
	if len(k.Hosts) != 2 || k.Hosts[1].Socket != "/run/libvirt/virtqemud-sock" || k.Hosts[1].Pool != "fast" {
		t.Errorf("hosts = %+v, want two hosts with lab2's socket and pool parsed", k.Hosts)
	}
}

func TestLoadConfig_kvmInsecureHostKeyNeedsNoKnownHosts(t *testing.T) {
	t.Parallel()
	yaml := strings.Replace(validKVMYAML,
		"knownHostsFile: /etc/proxy-operator/kvm/known_hosts",
		"insecureIgnoreHostKey: true", 1)
	if _, err := LoadConfig([]byte(yaml)); err != nil {
		t.Fatalf("LoadConfig() error = %v, want nil", err)
	}
}

func TestLoadConfig_kvmInvalid(t *testing.T) {
	t.Parallel()
	minimal := func(kvmBody string) string {
		return "providers:\n  - name: kvm-home\n    type: kvm\n    kvm:\n" + indent(kvmBody, 6)
	}
	hostsAndTypes := `
machineTypes:
  small: {vcpus: 1, memoryMiB: 1024}
hosts:
  - {name: nas1, address: nas1:22, user: virt, bridge: br0}
`
	tests := []struct {
		name       string
		yaml       string
		wantErrSub string
	}{
		{
			name:       "missing kvm block",
			yaml:       "providers:\n  - name: kvm-home\n    type: kvm\n",
			wantErrSub: "kvm block is required",
		},
		{
			name:       "missing sshKeyFile",
			yaml:       minimal("knownHostsFile: /kh\n" + hostsAndTypes),
			wantErrSub: "kvm.sshKeyFile is required",
		},
		{
			name:       "missing knownHostsFile without insecure flag",
			yaml:       minimal("sshKeyFile: /key\n" + hostsAndTypes),
			wantErrSub: "kvm.knownHostsFile is required unless",
		},
		{
			name:       "negative disk size",
			yaml:       minimal("sshKeyFile: /key\nknownHostsFile: /kh\ndiskSizeGb: -1\n" + hostsAndTypes),
			wantErrSub: "diskSizeGb must not be negative",
		},
		{
			name:       "no machine types",
			yaml:       minimal("sshKeyFile: /key\nknownHostsFile: /kh\nhosts:\n  - {name: nas1, address: nas1:22, user: virt, bridge: br0}\n"),
			wantErrSub: "machineTypes must define at least one",
		},
		{
			name:       "machine type with zero memory",
			yaml:       minimal("sshKeyFile: /key\nknownHostsFile: /kh\nmachineTypes:\n  small: {vcpus: 1}\nhosts:\n  - {name: nas1, address: nas1:22, user: virt, bridge: br0}\n"),
			wantErrSub: `machineTypes["small"] needs vcpus > 0 and memoryMiB > 0`,
		},
		{
			name:       "no hosts",
			yaml:       minimal("sshKeyFile: /key\nknownHostsFile: /kh\nmachineTypes:\n  small: {vcpus: 1, memoryMiB: 1024}\n"),
			wantErrSub: "kvm.hosts must list at least one host",
		},
		{
			name:       "duplicate host name",
			yaml:       minimal("sshKeyFile: /key\nknownHostsFile: /kh\nmachineTypes:\n  small: {vcpus: 1, memoryMiB: 1024}\nhosts:\n  - {name: nas1, address: a:22, user: virt, bridge: br0}\n  - {name: nas1, address: b:22, user: virt, bridge: br0}\n"),
			wantErrSub: `duplicate host name "nas1"`,
		},
		{
			name:       "host missing address",
			yaml:       minimal("sshKeyFile: /key\nknownHostsFile: /kh\nmachineTypes:\n  small: {vcpus: 1, memoryMiB: 1024}\nhosts:\n  - {name: nas1, user: virt, bridge: br0}\n"),
			wantErrSub: "address is required",
		},
		{
			name:       "host missing user",
			yaml:       minimal("sshKeyFile: /key\nknownHostsFile: /kh\nmachineTypes:\n  small: {vcpus: 1, memoryMiB: 1024}\nhosts:\n  - {name: nas1, address: a:22, bridge: br0}\n"),
			wantErrSub: "user is required",
		},
		{
			name:       "host missing bridge",
			yaml:       minimal("sshKeyFile: /key\nknownHostsFile: /kh\nmachineTypes:\n  small: {vcpus: 1, memoryMiB: 1024}\nhosts:\n  - {name: nas1, address: a:22, user: virt}\n"),
			wantErrSub: "bridge is required",
		},
		{
			name:       "image with non-http url",
			yaml:       minimal("sshKeyFile: /key\nknownHostsFile: /kh\nimages:\n  d: {url: file:///tmp/x.qcow2}\n" + hostsAndTypes),
			wantErrSub: `images["d"].url must be an http(s) URL`,
		},
		{
			name:       "image with bad sha256",
			yaml:       minimal("sshKeyFile: /key\nknownHostsFile: /kh\nimages:\n  d: {url: https://x/y.qcow2, sha256: abc}\n" + hostsAndTypes),
			wantErrSub: `images["d"].sha256 must be 64 hex characters`,
		},
		{
			name:       "image with unknown format",
			yaml:       minimal("sshKeyFile: /key\nknownHostsFile: /kh\nimages:\n  d: {url: https://x/y.vmdk, format: vmdk}\n" + hostsAndTypes),
			wantErrSub: `images["d"].format must be qcow2 or raw`,
		},
		{
			name: "kvm type with gcp block",
			yaml: `
providers:
  - name: p1
    type: kvm
    gcp:
      project: my-project`,
			wantErrSub: "type is kvm but a gcp block is set",
		},
		{
			name: "gcp type with kvm block",
			yaml: `
providers:
  - name: p1
    type: gcp
    gcp:
      project: my-project
    kvm:
      sshKeyFile: /key`,
			wantErrSub: "type is gcp but a kvm block is set",
		},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			_, err := LoadConfig([]byte(tc.yaml))
			if err == nil {
				t.Fatalf("LoadConfig() error = nil, want error containing %q", tc.wantErrSub)
			}
			if !strings.Contains(err.Error(), tc.wantErrSub) {
				t.Errorf("LoadConfig() error = %q, want substring %q", err.Error(), tc.wantErrSub)
			}
		})
	}
}

func indent(s string, n int) string {
	pad := strings.Repeat(" ", n)
	lines := strings.Split(strings.TrimLeft(s, "\n"), "\n")
	for i, l := range lines {
		if l != "" {
			lines[i] = pad + l
		}
	}
	return strings.Join(lines, "\n")
}